Top portion of a protective respiratory helmet



FIG. 1 is a perspective view of a top portion of a protective respiratory helmet showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a left side elevational view thereof, the right side being a mirror image.

The portion of the drawings shown in phantom is for illustrative purposes only and is not intended to form part of the claimed design. 

The ornamental design for a top portion of a protective respiratory helmet, as shown and described. 